The main supporting component of the electromechanical subsystem is the frame. The frame is constructed out of 0.75 by 0.75 inch pieces of wood. It takes the shape of a cube 30 cm to a side. The pieces are fastened with 1.25 inch brad nails. The bottom of the frame is covered with a 0.25 inch thick piece of plywood. Attached to this are four rubber feet which keeps the robot stable on any flat surface.
The frame served as the physical support for all other components of the system. Besides the circuitry attached directly to the sensor array, all other functional parts of the complete robot were fastened to the frame.
The PIC DevBugger board was attached to the top-left corner of the front face of the robot, above the door and receptacle for the tray (see below for description). Behind this, the signal hub was mounted so that the bus cable from the PIC DevBugger could easily reach it. At the back of the frame, the PSU and the stepper motor power circuitry was mounted.
A secondary supporting component of the robot was the tray receptacle door. The door was a 30 cm long, 2 inch high, and 1 inch thick piece of wood, attached to the frame with a hinge on left hand side, and secured when closed with a latch on the right. The side of the door facing internally has a 0.5 inch wide, 0.25 inch deep groove cut horizontally. This groove serves to hold the front side of the tray, which protrudes slightly from the front of the frame, and prevents the tray from moving backwards when the switch activation arrangement turns off the lights.